This is happening across a few large retailers[1] (Walmart, CVS). It's what happens when people panic and try to buyout the store's stock.
From the article:
> Since Roe was overturned on Friday, many people who can get pregnant have expressed their interest in stockpiling the pill. Sarah McKenna, a 21-year-old spiritual adviser and tarot card reader in Saylorsburg, Pa., told The New York Times this week that she went on Amazon to buy pills “not only for myself but for those who need it, because people are going to buy them and resell them for a crazy price.”
1 - https://news.yahoo.com/cvs-walmart-rationing-plan-b-02331539...